💡 Lights Out
Every tap flips a cross of lights. Turn the whole grid off.
GRID
MOVES 0PAR 0BEST 0
How to play Lights Out
- Every cell is either lit or dark.
- Tapping a cell toggles it and its four direct neighbours.
- Your goal is to switch the entire grid off.
- Every generated puzzle is guaranteed solvable.
Controls
| Input | Action |
|---|---|
| Click / Tap | Toggle a cell and its neighbours |
| Arrow keys + Enter | Move and toggle by keyboard |
| H | Reveal a hint move |
| R | New puzzle |
| F | Enter or leave full screen |
| Esc | Leave full screen |
Tips & strategy
- Work top to bottom: use row two to clear row one, row three to clear row two, and so on.
- Once only the bottom row is lit, the pattern there tells you which top-row cells to press.
- Order does not matter — pressing the same cell twice cancels out.
- The minimum solution never needs a cell pressed more than once.
Frequently asked questions
Is every puzzle solvable?
Yes. Boards are generated by scrambling a solved grid, so a solution always exists.
What does the move counter mean?
It tracks how many presses you have used. The par figure shown is the length of the scramble used to create the board.
Does grid size change difficulty?
Considerably. A 3×3 is a warm-up, while 5×5 usually needs the row-by-row method rather than intuition.